linux-kernel - Re: [PATCH 08/26] exit: Make the runqueue rcu safe

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Message-ID: <20170607131650.GA23434@redhat.com>
Date:   Wed, 7 Jun 2017 15:16:50 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kees Cook <keescook@...omium.org>,
        Roland McGrath <roland@...k.frob.com>,
        Al Viro <viro@...IV.linux.org.uk>,
        David Howells <dhowells@...hat.com>,
        "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
Subject: Re: [PATCH 08/26] exit: Make the runqueue rcu safe

On 06/06, Eric W. Biederman wrote:
>
> Add a rcu_usage to task_struct and use it to reuse the delayed rcu put
> logic from release_task in finish_task_switch.

I didn't really read this patch yet, but it first glance it should work and
you can also remove the ->exit_state check/limitation in rcuwait_wait_event().

Oleg.